300-415 Question #9: Real Exam Question with Answer & Explanation

The correct answer is D: 7. An application-aware firewall operating on a WAN Edge blocks applications at Layer 7 of the OSI model.

Security and Quality of Service

Question

At which layer does the application-aware firewall block applications on a WAN Edge?

An application-aware firewall operating on a WAN Edge blocks applications at Layer 7 of the OSI model.

Common mistakes.

A. Layer 3 (Network layer) firewalls block based on IP addresses and protocols, not specific applications.
B. Layer 5 (Session layer) firewalls focus on session establishment and termination, not deep application content inspection.
C. Layer 2 (Data Link layer) security typically involves MAC addresses and VLANs, not application blocking.

Concept tested. Application-aware firewall OSI layer

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/security/sdwan-security-cg-book/security-overview.html

#Application-aware firewall#OSI model#Layer 7 security#WAN Edge security

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